For this case what you should do is evaluate values of x in the function and verify that they meet the result of f (x) shown in the graph. The answer is f (x) = - 2lxl +1 notice that f (1) = - 2l1l + 1 = -1 f (-1) = - 2l-1l + 1 = -1 Both comply with the value of f (x) shown in the graph answer f (x) = - 2lxl +1
